siginterrupt

NAME

siginterrupt - allow signals to interrupt system calls

SYNOPSIS

#include<signal.h>intsiginterrupt(intsig, intflag);

DESCRIPTION

The siginterrupt() function is used to change the system call restart
behavior when a system call is interrupted by the specified signal. If
flag is false (0), system calls will be restarted if they are interrupted
by the specified signal sig and no data has been transferred yet. System
call restart is the default behavior on OpenBSD.
If flag is true (1), the restarting of system calls is disabled. If a
system call is interrupted by the specified signal and no data has been
transferred, the system call will return -1 with the global variable
errno set to EINTR. Interrupted system calls that have started
transferring data will return the amount of data actually transferred.
System call interrupt is the signal behavior found on BSD systems prior
to 4.2BSD as well as most systems based upon AT&T System V UNIX.
Programs may switch between restartable and interruptible system call
operation as often as desired in the execution of a program. Issuing a
siginterrupt() call during the execution of a signal handler will cause
the new action to take place on the next signal to be caught.

RETURN VALUES

siginterrupt() returns 0 on success or -1 if an invalid signal number has
been specified.